There are many places in Portugal which
are interesting seen from a geographical point of view.

For example
– Olivença/Olivenza region, where Portugal and Spain never agreed
on the border.
Link:
http://www.olivenca.org/litigio_uk.htm– Rio de Onor/Rihonor de Castilla,
which form practically the same village divided by the border and
inhabitants own fields on the opposite side of the border.
Link (Rio de Onor):– Barrancos, a big
'finger' into Spanish territory with a peculiar dialect
(barranquenho).Link:
http://en.wikipedia.org/wiki/Barrancos